P Brewer wrote:
> Working on the IRTC topic, and here is some work in process....  I thought it
> made a pretty good image on it's own.
> 
> The raised ground is a pigment converted to isosurface.

One comment: I don't think rivers are supposed to be at sea level for 
their entire course. They start at a high elevation and approach sea 
level toward the mouth.

-Mike

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